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Improve device enumeration logic in BlEnumerateBlockDevices
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These changes result in a more robust and reliable device enumeration process, better prepared to handle edge cases and non-standard firmware behavior.
This commit is contained in:
Aiken Harris 2025-07-29 10:44:50 +02:00 committed by CodingWorkshop Signing Team
parent 486e987b71
commit b0aabf96b8
Signed by: CodingWorkshop Signing Team
GPG Key ID: 6DC88369C82795D2
1 changed files with 59 additions and 49 deletions
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108
xtldr/volume.c
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@ -4,6 +4,7 @@
* FILE: xtldr/volume.c
* DESCRIPTION: XTLDR volume support
* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
* Aiken Harris <harraiken91@gmail.com>
*/
#include <xtldr.h>
@ -78,21 +79,41 @@ BlEnumerateBlockDevices()
ListEntry = BlockDevices.Flink;
while(ListEntry != &BlockDevices)
{
/* Take block device from the list */
/* Get data for the next discovered device. */
BlockDeviceData = CONTAIN_RECORD(ListEntry, EFI_BLOCK_DEVICE_DATA, ListEntry);
/* Find last node */
Status = BlpFindLastBlockDeviceNode(BlockDeviceData->DevicePath, &LastNode);
if(Status != STATUS_EFI_SUCCESS)
{
/* Skip this device if its last node cannot be found, as it is required for classification */
BlDebugPrint(L"WARNING: Block device last node not found\n");
ListEntry = ListEntry->Flink;
continue;
}
/* Set drive type to 'unknown' by default */
/* Initialize drive type before attempting to classify the device */
DriveType = XTBL_BOOT_DEVICE_UNKNOWN;
/* Locate the parent for this block device to ensure it is not an orphaned entry */
if(!BlpFindParentBlockDevice(&BlockDevices, BlockDeviceData, &ParentNode))
{
/* Orphaned device found. Log a warning and skip it as it cannot be properly classified */
BlDebugPrint(L"WARNING: No parent device found, skipping orphaned media device path\n");
ListEntry = ListEntry->Flink;
continue;
}
/* Verify that media information is available, as some devices may not report it */
if(!BlockDeviceData->BlockIo->Media)
{
/* The device is unusable without media info, log a warning and skip it */
BlDebugPrint(L"WARNING: Block device is missing media information\n");
ListEntry = ListEntry->Flink;
continue;
}
Media = BlockDeviceData->BlockIo->Media;
/* Check last node type */
if(LastNode->Type == EFI_ACPI_DEVICE_PATH && LastNode->SubType == EFI_ACPI_DP)
{
@ -101,65 +122,54 @@ BlEnumerateBlockDevices()
if(AcpiDevice->HID == 0x60441D0 || AcpiDevice->HID == 0x70041D0 || AcpiDevice->HID == 0x70141D1)
{
/* Floppy drive found */
Media = BlockDeviceData->BlockIo->Media;
DriveType = XTBL_BOOT_DEVICE_FLOPPY;
DriveNumber = FDCount++;
PartitionNumber = 0;
/* Print debug message */
BlDebugPrint(L"Found Floppy Disk (DiskNumber: %lu, MediaPresent: %u, RO: %u)\n",
DriveNumber, Media->MediaPresent, Media->ReadOnly);
DriveNumber, Media->MediaPresent, Media->ReadOnly);
}
}
else if(LastNode->Type == EFI_MEDIA_DEVICE_PATH)
else if((LastNode->Type == EFI_MEDIA_DEVICE_PATH && LastNode->SubType == EFI_MEDIA_CDROM_DP) ||
(LastNode->Type == EFI_MESSAGING_DEVICE_PATH &&
(LastNode->SubType == EFI_MESSAGING_ATAPI_DP || LastNode->SubType == EFI_MESSAGING_SATA_DP) &&
Media->MediaPresent && Media->RemovableMedia))
{
/* Media device path found */
if(LastNode->SubType == EFI_MEDIA_CDROM_DP)
{
/* Optical drive found */
Media = BlockDeviceData->BlockIo->Media;
DriveType = XTBL_BOOT_DEVICE_CDROM;
DriveNumber = CDCount++;
PartitionNumber = 0;
/* Optical drive found */
DriveType = XTBL_BOOT_DEVICE_CDROM;
DriveNumber = CDCount++;
PartitionNumber = 0;
/* Print debug message */
BlDebugPrint(L"Found CD-ROM drive (DriveNumber: %lu, MediaPresent: %u, RemovableMedia: %u, RO: %u)\n",
DriveNumber, Media->MediaPresent, Media->RemovableMedia, Media->ReadOnly);
}
else if(LastNode->SubType == EFI_MEDIA_HARDDRIVE_DP)
{
/* Hard disk partition found */
Media = BlockDeviceData->BlockIo->Media;
HDPath = (PEFI_HARDDRIVE_DEVICE_PATH)LastNode;
DriveType = XTBL_BOOT_DEVICE_HARDDISK;
DriveNumber = (HDPath->PartitionNumber == 1) ? HDCount++ : HDCount - 1;
PartitionNumber = HDPath->PartitionNumber;
PartitionGuid = (PEFI_GUID)HDPath->Signature;
/* Print debug message */
BlDebugPrint(L"Found CD-ROM drive (DriveNumber: %lu, MediaPresent: %u, RemovableMedia: %u, RO: %u)\n",
DriveNumber, Media->MediaPresent, Media->RemovableMedia, Media->ReadOnly);
}
else if(LastNode->Type == EFI_MEDIA_DEVICE_PATH && LastNode->SubType == EFI_MEDIA_HARDDRIVE_DP)
{
/* Hard disk partition found */
HDPath = (PEFI_HARDDRIVE_DEVICE_PATH)LastNode;
DriveType = XTBL_BOOT_DEVICE_HARDDISK;
DriveNumber = (HDPath->PartitionNumber == 1) ? HDCount++ : HDCount - 1;
PartitionNumber = HDPath->PartitionNumber;
PartitionGuid = (PEFI_GUID)HDPath->Signature;
/* Print debug message */
BlDebugPrint(L"Found Hard Disk partition (DiskNumber: %lu, PartNumber: %lu, "
L"MBRType: %u, GUID: {%V}, PartSize: %uB)\n",
DriveNumber, PartitionNumber, HDPath->MBRType,
PartitionGuid, HDPath->PartitionSize * Media->BlockSize);
}
else if(LastNode->SubType == EFI_MEDIA_RAMDISK_DP)
{
/* RAM disk found */
Media = BlockDeviceData->BlockIo->Media;
DriveType = XTBL_BOOT_DEVICE_RAMDISK;
DriveNumber = RDCount++;
PartitionNumber = 0;
/* Print debug message */
BlDebugPrint(L"Found Hard Disk partition (DiskNumber: %lu, PartNumber: %lu, "
L"MBRType: %u, GUID: {%V}, PartSize: %uB)\n",
DriveNumber, PartitionNumber, HDPath->MBRType,
PartitionGuid, HDPath->PartitionSize * Media->BlockSize);
}
else if(LastNode->Type == EFI_MEDIA_DEVICE_PATH && LastNode->SubType == EFI_MEDIA_RAMDISK_DP)
{
/* RAM disk found */
DriveType = XTBL_BOOT_DEVICE_RAMDISK;
DriveNumber = RDCount++;
PartitionNumber = 0;
/* Print debug message */
BlDebugPrint(L"Found RAM Disk (DiskNumber: %lu, MediaPresent: %u)\n",
DriveNumber, Media->MediaPresent);
}
if(!BlpFindParentBlockDevice(&BlockDevices, BlockDeviceData, &ParentNode))
{
BlDebugPrint(L"WARNING: No parent device found, skipping orphaned media device path\n");
continue;
}
/* Print debug message */
BlDebugPrint(L"Found RAM Disk (DiskNumber: %lu, MediaPresent: %u)\n",
DriveNumber, Media->MediaPresent);
}
/* Make sure the device found has valid type set */